Acta Physica Polonica. B, 1999, no. 11, s. 3211-3228
Laser interferometrie experiments planned for 2002 will open up a new
window onto the Universe. The first part of the paper gives a brief intuitive
introduction to gravity waves, detection techniques and enumeration
of main astrophysical sources and frequency bands to which they
contribute. Then two more specific issues are discussed concerning cosmological
perspectives of gravity waves detection. First one is the problem
of gravitational lensing of the signal from inspiralling NS-NS binaries.
The magnitude of the so called magnification bias is estimated and found
non-negligible for some quite realistic lens models, but strongly modeldependent.
The second problem is connected with estimates of galactic
and extragalactic parts of the stochastic background. The main conclusion
from these two examples is that in so far as the cosmological payoff of gravitational
wave detection would be high, we should substantially deepen our
understanding of basic astrophysical properties of galaxies and their clusters
(in terms of mass distribution) in order to draw clear cosmological